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Derivative Instruments and Hedging Activities - Interest Rate Swaps (Details) - Designated as Hedging Instrument - Cash Flow Hedging - Interest rate swaps - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 395,500,000 | $ 345,500,000
Weighted Average Fixed Interest Rate | 2.43% | 2.33%
Weighted Average Variable Interest Rate | 2.35% | 1.38%
2024 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 98,000,000 | $ 98,000,000
Weighted Average Fixed Interest Rate | 2.18% | 2.18%
Weighted Average Variable Interest Rate | 2.35% | 1.36%
2027 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 247,500,000 | $ 247,500,000
Weighted Average Fixed Interest Rate | 2.39% | 2.39%
Weighted Average Variable Interest Rate | 2.35% | 1.39%
2028 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | $ 50,000,000 | $ 0
Weighted Average Fixed Interest Rate | 3.13% | 0.00%
Weighted Average Variable Interest Rate | 2.32% | 0.00%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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